The key information provided by the journalist is:
1) A chicken bone was found in a South American archaeological site dating between 1321-1407 AD.
2) The DNA sequence of this chicken bone was identical to chicken remains found in Polynesian islands like Tonga and American Samoa.
3) This period (1321-1407 AD) was when the easternmost Polynesian islands were being colonized before Europeans arrived.
Based on this, the option most strongly supported is:
B. People may have traveled between the Polynesian islands and South America before Spaniards came to South America.
The matching DNA sequences between the South American and Polynesian chicken remains, and the fact that this predates European arrival, strongly suggests there was some contact/travel between these regions that allowed chickens to be transported from one area to the other.
The other options are not as well supported:
A) It doesn't necessarily mean chickens were first domesticated in Polynesia.
C) There is no evidence that chickens spread from the Americas to Europe.
D) No evidence is provided about the origin of Polynesian colonizers coming from South America.
E) The evidence points to chickens being transported before Europeans arrived, not by Europeans.
So option B is the one most strongly supported by the given information.